Differential Maintenance - AWD Models - Toyota Sienna Forum - siennachat.com
 
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post #1 of 5 (permalink) Old 07-06-2010, 12:47 AM Thread Starter
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Differential Maintenance - AWD Models

My rear differential started leaking, occasionally I would find one or two drops of oil on the garage floor.
I looked under and noticed that it was leaking through one of the oil seals, long story short, it was being caused by the vent being seized, this is one of those parts I thought to be maintenance free... big mistake.
I removed the vent (pic 1) and it looked like a one piece component. I dipped it in a strong solvent and waited a while but still, one solid piece (pic 2). I tried to blow air through it and nothing. I then decide to risk it and took a wrench and pliers and twist it (pic 3), it finally moved and a lot of debris started falling down. I cleaned it pretty well and reinstalled it.
I then changed the oil (pic 4), removed the fill plug (pic 5) and the drain plug (pics 6 & 7), this last one was full of old oil (almost grease) around the magnet. Finally added the new oil (pic 8 ) and torque the plugs.
I strongly recommend all AWD owners to check this vent at least after every winter (maybe its in the manual and I never noticed it), get under and try to turn vent cap with your fingers, if you can't, remove it and clean it.
I hope the pics help.
Attached Images
File Type: jpg Dif 1.jpg (278.2 KB, 346 views)
File Type: jpg Dif 2.jpg (192.6 KB, 288 views)
File Type: jpg Dif 3.jpg (242.8 KB, 277 views)
File Type: jpg Dif 4.jpg (277.6 KB, 245 views)
File Type: jpg Dif 5.jpg (264.1 KB, 239 views)
File Type: jpg Dif 6.jpg (272.7 KB, 232 views)
File Type: jpg Dif 7.jpg (221.7 KB, 214 views)
File Type: jpg Dif 8.jpg (282.2 KB, 236 views)

2004 LE AWD
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post #2 of 5 (permalink) Old 07-06-2010, 08:09 PM
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Re: Differential Maintenance - AWD Models

Great tip.

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post #3 of 5 (permalink) Old 07-19-2010, 11:32 PM
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Re: Differential Maintenance - AWD Models

Quote:
Originally Posted by jmanotas
My rear differential started leaking, occasionally I would find one or two drops of oil on the garage floor.
I looked under and noticed that it was leaking through one of the oil seals, long story short, it was being caused by the vent being seized, this is one of those parts I thought to be maintenance free... big mistake.
I removed the vent (pic 1) and it looked like a one piece component. I dipped it in a strong solvent and waited a while but still, one solid piece (pic 2). I tried to blow air through it and nothing. I then decide to risk it and took a wrench and pliers and twist it (pic 3), it finally moved and a lot of debris started falling down. I cleaned it pretty well and reinstalled it.
I then changed the oil (pic 4), removed the fill plug (pic 5) and the drain plug (pics 6 & 7), this last one was full of old oil (almost grease) around the magnet. Finally added the new oil (pic 8 ) and torque the plugs.
I strongly recommend all AWD owners to check this vent at least after every winter (maybe its in the manual and I never noticed it), get under and try to turn vent cap with your fingers, if you can't, remove it and clean it.
I hope the pics help.
Thanks for the big tip! My van has around 200k on it and the breather was indeed stuck also. I think that anyone with and awd model should be looking at this! I haven't had any leaks and maybe won't thanks to this website!

cheers,

shineysideup
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post #4 of 5 (permalink) Old 08-19-2015, 04:41 PM
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Re: Differential Maintenance - AWD Models

I know what I'll be doing Saturday. How is the '04 holding up? Do you still have it?

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post #5 of 5 (permalink) Old 04-28-2016, 06:06 PM Thread Starter
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Re: Differential Maintenance - AWD Models

Haven't been around for a while, yes, still have it and its now my daily driver. Bought a 2015 Pathfinder that became our travel/towing vehicle which is nice but far off from the comfort and roominess of the Sienna.

2004 LE AWD
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